粘性土的透水性首先取决于孔隙的大小,其次是孔隙的多少。本文在对洛川塬黄土地层进行水银测孔试验和渗透试验的基础上,用曲线图分析法及逐步回归分析法对自变量进行筛选,找出了黄土地层透水的最小孔径大于5μm,并以此推算出黄土地层中结合水的厚度约是水分子直径的9000倍。文中还建立了描述渗透系数与透水孔隙孔容关系的随机数学模型,开辟了一条通过水银测孔取得粘性土渗透系数值的新途径。 The permeability of cohesive soil first depends on the size of the pores, followed by the size of the pores. Based on the mercury porosimetry test and the permeability test of Luochuan Loess Plateau, the independent variable was screened by the curve analysis method and the stepwise regression analysis method. The minimum pore size of the pervious loess layer was found to be greater than 5 μm. It is calculated that the thickness of the bound water in the loess layer is about 9,000 times the diameter of the water molecules. The paper also established a stochastic mathematical model describing the relationship between the permeability coefficient and the pore volume of pervious pores, and opened up a new way to obtain the permeability coefficient value of clay soil through mercury measurement.